The move will see SMC DTR:UK's 11 staff set up home in SMC Gower's existing office, in the Round Foundry block, Holbeck, and brings the total number of architects and support staff under one roof to 94.
Former SMC DTR:UK director Paul Thrussell, who becomes a director of the newly enlarged SMC Gower, said: 'This merger, and the expertise and commercial approach we bring, will continue to establish SMC Gower Architects as a formidable player among Yorkshire's practices.
'Our team will have the opportunity to grow as part of a larger operation while adding to the practice's youth, creativity and strength in depth across the spectrum of architectural disciplines, particularly interior design.'
Only SMC DTR:UK's Leeds office is merging with SMC Gower Architects - leaving SMC DTR:UK's other strongholds in Manchester and Liverpool untouched.
The practice, founded as Dempster, Thrussell and Rae in Bradford in 1992, was gobbled up by the ever-acquisitive SMC Group two years ago.